Statutory Requirements (Details)
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12 Months Ended | 12 Months Ended | |||||||||||||||||||||||||||
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Dec. 31, 2012
USD ($)
|
Dec. 31, 2011
USD ($)
|
Dec. 31, 2012
New York
|
Dec. 31, 2012
Bermuda
USD ($)
|
Dec. 31, 2011
Bermuda
USD ($)
|
Dec. 31, 2012
Glencoe [Member]
USD ($)
|
Dec. 31, 2011
Glencoe [Member]
USD ($)
|
Dec. 31, 2012
DaVinciRe [Member]
USD ($)
|
Dec. 31, 2011
DaVinciRe [Member]
USD ($)
|
Dec. 31, 2012
Renaissance Reinsurance [Member]
USD ($)
|
Dec. 31, 2011
Renaissance Reinsurance [Member]
USD ($)
|
Dec. 31, 2012
Syndicate 1458 [Member]
GBP (£)
|
Dec. 31, 2011
Syndicate 1458 [Member]
GBP (£)
|
Dec. 31, 2012
Citibank Europe PLC [Member]
Letter of Credit [Member]
Syndicate 1458 [Member]
USD ($)
|
Dec. 31, 2012
Citibank Europe PLC [Member]
Letter of Credit [Member]
Syndicate 1458 [Member]
GBP (£)
|
Dec. 31, 2011
Citibank Europe PLC [Member]
Letter of Credit [Member]
Syndicate 1458 [Member]
USD ($)
|
Dec. 31, 2011
Citibank Europe PLC [Member]
Letter of Credit [Member]
Syndicate 1458 [Member]
GBP (£)
|
Dec. 31, 2012
Multi-Beneficiary Reinsurance Trust [Member]
DaVinciRe [Member]
New York
USD ($)
|
Dec. 31, 2011
Multi-Beneficiary Reinsurance Trust [Member]
DaVinciRe [Member]
New York
USD ($)
|
Dec. 31, 2012
Multi-Beneficiary Reinsurance Trust [Member]
Renaissance Reinsurance [Member]
New York
USD ($)
|
Dec. 31, 2011
Multi-Beneficiary Reinsurance Trust [Member]
Renaissance Reinsurance [Member]
New York
USD ($)
|
Dec. 31, 2012
Multi-Beneficiary Reducted Collateral Reinsurance Trust [Member]
DaVinciRe [Member]
New York
USD ($)
|
Dec. 31, 2012
Multi-Beneficiary Reducted Collateral Reinsurance Trust [Member]
Renaissance Reinsurance [Member]
New York
USD ($)
|
Dec. 31, 2012
Minimum [Member]
Multi-Beneficiary Reinsurance Trust [Member]
DaVinciRe [Member]
New York
USD ($)
|
Dec. 31, 2011
Minimum [Member]
Multi-Beneficiary Reinsurance Trust [Member]
DaVinciRe [Member]
New York
USD ($)
|
Dec. 31, 2012
Minimum [Member]
Multi-Beneficiary Reinsurance Trust [Member]
Renaissance Reinsurance [Member]
New York
USD ($)
|
Dec. 31, 2011
Minimum [Member]
Multi-Beneficiary Reinsurance Trust [Member]
Renaissance Reinsurance [Member]
New York
USD ($)
|
Dec. 31, 2012
Minimum [Member]
Multi-Beneficiary Reducted Collateral Reinsurance Trust [Member]
DaVinciRe [Member]
New York
USD ($)
|
Dec. 31, 2012
Minimum [Member]
Multi-Beneficiary Reducted Collateral Reinsurance Trust [Member]
Renaissance Reinsurance [Member]
New York
USD ($)
|
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Statutory Accounting Practices [Line Items] | |||||||||||||||||||||||||||||
Statutory capital and surplus | $ 3,100,000,000 | $ 2,700,000,000 | |||||||||||||||||||||||||||
Minimum statutory capital and surplus required | 554,800,000 | 552,900,000 | 183,200,000 | 93,800,000 | |||||||||||||||||||||||||
Target capital level as a percentage of Enhanced Capital Requirement | 120.00% | ||||||||||||||||||||||||||||
Dividend rate, maximum percentage of prior year statutory capital and surplus | 20.00% | 25.00% | |||||||||||||||||||||||||||
Capital reduction, maximum percentage reduction of prior year statutory capital and surplus | 15.00% | ||||||||||||||||||||||||||||
Aggregate cash dividends | 0 | 15,900,000 | 108,000,000 | 6,800,000 | 482,000,000 | 180,700,000 | |||||||||||||||||||||||
Return of Capital, Declared | 0 | 234,100,000 | |||||||||||||||||||||||||||
Line of credit facility, amount outstanding | 222,000,000 | 45,500,000 | 118,500,000 | 24,500,000 | |||||||||||||||||||||||||
Funds at Lloyd's, amount supported by letters of credit | 100.00% | ||||||||||||||||||||||||||||
Assets Held-in-trust | $ 1,490,900,000 | $ 1,292,700,000 | $ 180,100,000 | $ 101,900,000 | $ 508,700,000 | $ 450,800,000 | $ 11,000,000 | $ 11,000,000 | $ 169,100,000 | $ 73,900,000 | $ 494,900,000 | $ 274,500,000 | $ 10,000,000 | $ 10,000,000 |